1 | // $Id: matrix.h 415 2005-12-01 15:52:36Z jari $ |
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2 | |
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3 | #ifndef _theplu_gslapi_matrix_ |
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4 | #define _theplu_gslapi_matrix_ |
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5 | |
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6 | #include <c++_tools/gslapi/vector.h> |
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7 | #include <c++_tools/utility/Exception.h> |
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8 | |
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9 | #include <gsl/gsl_matrix.h> |
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10 | #include <iostream> |
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11 | |
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12 | namespace theplu { |
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13 | namespace gslapi { |
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14 | |
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15 | class vector; |
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16 | |
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17 | /// |
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18 | /// This is the C++ tools interface to GSL matrix. 'double' is the |
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19 | /// only type supported, maybe we should add a 'complex' type as |
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20 | /// well in the future. |
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21 | /// |
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22 | /// \par[File streams] Reading and writing vectors to file streams |
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23 | /// are of course supported. These are implemented without using GSL |
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24 | /// functionality, and thus binary read and write to streams are not |
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25 | /// supported. |
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26 | /// |
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27 | /// \par[Matrix views] GSL matrix views are supported and these are |
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28 | /// disguised as ordinary gslapi::matrix'es. A support function is |
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29 | /// added, gslapi::matrix::isview(), that can be used to check if a |
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30 | /// matrix object is a view. Note that view matricess do not own the |
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31 | /// undelying data, and a view is not valid if the matrix owning the |
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32 | /// data is deallocated. |
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33 | /// |
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34 | /// @note All GSL matrix related functions are not implement but |
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35 | /// most functionality defined for GSL matrices can be achieved with |
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36 | /// this interface class. Most notable GSL functionality not |
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37 | /// supported are no binary file support and views on arrays, |
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38 | /// gslapi::vectors, gsl_vectors, diagonals, subdiagonals, and |
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39 | /// superdiagonals. If there is an interest from the user community, |
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40 | /// the omitted functionality could be included. |
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41 | /// |
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42 | /// @todo Maybe it would be smart to create temporary objects need |
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43 | /// for BLAS in constructors. As it is now temporary objects are |
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44 | /// called before BLAS functionality iss used, cf. const matrix& |
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45 | /// matrix::operator*=(const matrix& other) |
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46 | /// |
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47 | class matrix |
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48 | { |
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49 | public: |
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50 | |
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51 | /// |
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52 | /// The default constructor. |
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53 | /// |
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54 | /// This contructor does not initialize underlying (essential) |
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55 | /// structures. |
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56 | /// |
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57 | inline matrix(void) : m_(NULL), view_(NULL) {} |
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58 | |
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59 | /// |
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60 | /// Constructor. Allocates memory space for \a r times \a c |
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61 | /// elements, and sets all elements to \a init_value. |
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62 | /// |
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63 | inline matrix(const size_t& r, const size_t& c, double init_value=0) |
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64 | : view_(NULL) { m_ = gsl_matrix_alloc(r,c); set_all(init_value); } |
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65 | |
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66 | /// |
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67 | /// The copy constructor. |
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68 | /// |
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69 | /// @note If the object to be copied is a matrix view, the values |
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70 | /// of the view will be copied, i.e. the view is not copied. |
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71 | /// |
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72 | inline matrix(const matrix& o) : view_(NULL) {m_=o.create_gsl_matrix_copy();} |
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73 | |
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74 | /// |
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75 | /// The matrix view constructor. |
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76 | /// |
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77 | /// Create a view of matrix \a m, with starting row \a offset_row, |
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78 | /// starting column \a offset_column, row size \a n_row, and |
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79 | /// column size \a n_column. |
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80 | /// |
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81 | /// A matrix view can be used as any matrix with the difference |
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82 | /// that changes made to the view will also change the object that |
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83 | /// is viewed. Also, using the copy constructor will create a new |
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84 | /// matrix object that is a copy of whatever is viewed. If a copy |
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85 | /// of the view is needed then you should use this constructor to |
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86 | /// obtain a copy. |
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87 | /// |
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88 | /// @note If the object viewed by the view goes out of scope or is |
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89 | /// deleted, the view becomes invalid and the result of further |
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90 | /// use is undefined. |
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91 | /// |
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92 | matrix(matrix& m, size_t offset_row, size_t offset_column, size_t n_row, |
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93 | size_t n_column); |
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94 | |
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95 | /// |
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96 | /// The istream constructor. |
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97 | /// |
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98 | /// Matrix rows are sepearated with the new line character, and |
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99 | /// column elements in a row must be separated with white space |
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100 | /// characters except the new line (\\n) character. Rows, and |
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101 | /// columns, are read consecutively and only rectangular matrices |
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102 | /// are supported. Empty lines are ignored. End of input is at end |
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103 | /// of file marker. |
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104 | /// |
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105 | explicit matrix(std::istream &) throw (utility::IO_error,std::exception); |
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106 | |
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107 | /// |
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108 | /// The destructor. |
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109 | /// |
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110 | ~matrix(void); |
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111 | |
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112 | /// |
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113 | /// Elementwise addition of the elements of matrix \a b to the |
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114 | /// elements of the calling matrix ,\f$a_{ij} = a_{ij} + b_{ij} \; |
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115 | /// \forall i,j\f$. The result is stored into the calling matrix. |
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116 | /// |
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117 | /// @return Whatever GSL returns. |
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118 | /// |
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119 | inline int add(const matrix& b) { return gsl_matrix_add(m_,b.m_); } |
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120 | |
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121 | /// |
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122 | /// Add the scalar value \a d to the elements of the calling |
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123 | /// matrix, \f$a_{ij} = a_{ij} + d \; \forall i,j\f$. The result |
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124 | /// is stored into the calling matrix. |
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125 | /// |
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126 | /// @return Whatever GSL returns. |
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127 | /// |
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128 | inline int |
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129 | add_constant(const double d) { return gsl_matrix_add_constant(m_,d); } |
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130 | |
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131 | /// |
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132 | /// @return The number of columns in the matrix. |
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133 | /// |
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134 | inline size_t columns(void) const { return m_->size2; } |
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135 | |
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136 | /// |
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137 | /// Elementwise division of the elemnts of the calling matrix by |
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138 | /// the elements of matrix \a b, \f$a_{ij} = a_{ij} / b_{ij} \; |
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139 | /// \forall i,j\f$. The result is stored into the calling matrix. |
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140 | /// |
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141 | /// @return Whatever GSL returns. |
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142 | /// |
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143 | inline int |
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144 | div_elements(const matrix& b) { return gsl_matrix_div_elements(m_,b.m_); } |
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145 | |
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146 | /// |
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147 | /// Check whether matrices are equal within a user defined |
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148 | /// precision, set by \a precision. |
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149 | /// |
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150 | /// @return True if each element deviates less or equal than \a |
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151 | /// d. If any matrix contain a NaN, false is always returned. |
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152 | /// |
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153 | bool equal(const matrix&, const double precision=0) const; |
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154 | |
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155 | /// |
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156 | /// @return A const pointer to the internal GSL matrix. |
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157 | /// |
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158 | inline const gsl_matrix* gsl_matrix_p(void) const { return m_; } |
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159 | |
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160 | /// |
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161 | /// @return A pointer to the internal GSL matrix. |
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162 | /// |
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163 | // Jari, is this needed? |
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164 | inline gsl_matrix* gsl_matrix_p(void) { return m_; }; |
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165 | |
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166 | /// |
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167 | /// @return True if all elements in the matrix is zero, false |
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168 | /// othwerwise; |
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169 | /// |
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170 | inline bool isnull(void) const { return gsl_matrix_isnull(m_); } |
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171 | |
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172 | /// |
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173 | /// Check if the matrix object is a view (sub-matrix) to another |
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174 | /// matrix. |
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175 | /// |
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176 | /// @return True if the object is a view, false othwerwise. |
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177 | /// |
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178 | inline bool isview(void) const { return view_; } |
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179 | |
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180 | /// |
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181 | /// @return The maximum value of the matrix. |
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182 | /// |
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183 | inline double max(void) const { return gsl_matrix_max(m_); } |
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184 | |
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185 | /// |
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186 | /// @return The index to the element with the maximum value of the |
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187 | /// matrix. The lowest index has precedence (searching in |
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188 | /// row-major order). |
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189 | /// |
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190 | inline std::pair<size_t,size_t> max_index(void) const; |
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191 | |
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192 | /// |
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193 | /// @return The minimum value of the matrix. |
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194 | /// |
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195 | inline double min(void) const { return gsl_matrix_min(m_); } |
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196 | |
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197 | /// |
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198 | /// @return The index to the element with the minimum value of the |
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199 | /// matrix. The lowest index has precedence (searching in |
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200 | /// row-major order). |
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201 | /// |
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202 | inline std::pair<size_t,size_t> min_index(void) const; |
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203 | |
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204 | /// |
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205 | /// @return The indecies to the element with the minimum and |
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206 | /// maximum values of the matrix, respectively. The lowest index |
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207 | /// has precedence (searching in row-major order). |
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208 | /// |
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209 | inline void minmax_index(std::pair<size_t,size_t>& min, |
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210 | std::pair<size_t,size_t>& max) const |
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211 | { gsl_matrix_minmax_index(m_,&min.first,&min.second, |
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212 | &max.first,&max.second); } |
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213 | |
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214 | /// |
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215 | /// @return The minimum and maximum values of the matrix, as the |
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216 | /// \a first and \a second member of the returned \a pair, |
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217 | /// respectively. |
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218 | /// |
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219 | std::pair<double,double> minmax(void) const; |
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220 | |
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221 | /// |
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222 | /// Multiply the elements of matrix \a b with the elements of the |
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223 | /// calling matrix ,\f$a_{ij} = a_{ij} * b_{ij} \; \forall |
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224 | /// i,j\f$. The result is stored into the calling matrix. |
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225 | /// |
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226 | /// @return Whatever GSL returns. |
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227 | /// |
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228 | inline int |
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229 | mul_elements(const matrix& b) { return gsl_matrix_mul_elements(m_,b.m_); } |
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230 | |
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231 | /// |
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232 | /// @return The number of rows in the matrix. |
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233 | /// |
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234 | inline size_t rows(void) const { return m_->size1; } |
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235 | |
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236 | /// |
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237 | /// Multiply the elements of the calling matrix with a scalar \a |
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238 | /// d, \f$a_{ij} = d * a_{ij} \; \forall i,j\f$. The result is |
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239 | /// stored into the calling matrix. |
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240 | /// |
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241 | /// @return Whatever GSL returns. |
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242 | /// |
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243 | inline int scale(const double d) { return gsl_matrix_scale(m_,d); } |
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244 | |
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245 | /// |
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246 | /// Set element values to values in \a mat. This function is |
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247 | /// needed for assignment of viewed elements. |
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248 | /// |
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249 | /// @return Whatever GSL returns. |
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250 | /// |
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251 | /// @note No check on size is done. |
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252 | /// |
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253 | /// @see const matrix& operator=(const matrix&) |
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254 | /// |
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255 | inline int set(const matrix& mat) { return gsl_matrix_memcpy(m_,mat.m_); } |
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256 | |
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257 | /// |
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258 | /// Set all elements to \a value. |
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259 | /// |
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260 | inline void set_all(const double value) { gsl_matrix_set_all(m_,value); } |
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261 | |
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262 | /// |
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263 | /// Set \a column values to values in \a vec. |
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264 | /// |
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265 | /// @return Whatever GSL returns. |
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266 | /// |
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267 | /// @note No check on size is done. |
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268 | /// |
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269 | inline int set_column(const size_t column, const vector& vec) |
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270 | { return gsl_matrix_set_col(m_, column, vec.gsl_vector_p()); } |
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271 | |
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272 | /// |
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273 | /// Set \a row values to values in \a vec. |
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274 | /// |
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275 | /// @return Whatever GSL returns. |
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276 | /// |
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277 | /// @note No check on size is done. |
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278 | /// |
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279 | inline int set_row(const size_t row, const vector& vec) |
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280 | { return gsl_matrix_set_row(m_, row, vec.gsl_vector_p()); } |
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281 | |
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282 | /// |
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283 | /// Subtract the elements of matrix \a b from the elements of the |
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284 | /// calling matrix ,\f$a_{ij} = a_{ij} - b_{ij} \; \forall |
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285 | /// i,j\f$. The result is stored into the calling matrix. |
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286 | /// |
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287 | /// @return Whatever GSL returns. |
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288 | /// |
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289 | inline int sub(const matrix& b) { return gsl_matrix_sub(m_,b.m_); } |
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290 | |
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291 | /// |
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292 | /// Exchange the elements of the this and \a other by copying. The |
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293 | /// two matrices must have the same size. |
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294 | /// |
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295 | /// @return Whatever GSL returns. |
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296 | /// |
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297 | inline int swap(matrix& other) { return gsl_matrix_swap(m_,other.m_); } |
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298 | |
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299 | /// |
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300 | /// Swap columns \a i and \a j. |
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301 | /// |
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302 | inline int swap_columns(const size_t i,const size_t j) |
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303 | { return gsl_matrix_swap_columns(m_,i,j); } |
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304 | |
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305 | /// |
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306 | /// Swap row \a i and column \a j. |
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307 | /// |
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308 | inline int swap_rowcol(const size_t i,const size_t j) |
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309 | { return gsl_matrix_swap_rowcol(m_,i,j); } |
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310 | |
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311 | /// |
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312 | /// Swap rows \a i and \a j. |
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313 | /// |
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314 | inline int swap_rows(const size_t i, const size_t j) |
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315 | { return gsl_matrix_swap_rows(m_,i,j); } |
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316 | |
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317 | /// |
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318 | /// Transpose the matrix. |
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319 | /// |
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320 | void transpose(void); |
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321 | |
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322 | /// |
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323 | /// @return Reference to the element position (\a row, \a column). |
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324 | /// |
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325 | inline double& operator()(size_t row,size_t column) |
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326 | { return (*gsl_matrix_ptr(m_,row,column)); } |
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327 | |
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328 | /// |
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329 | /// @return Const reference to the element position (\a row, \a |
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330 | /// column). |
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331 | /// |
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332 | inline const double& operator()(size_t row,size_t column) const |
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333 | { return (*gsl_matrix_const_ptr(m_,row,column)); } |
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334 | |
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335 | /// |
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336 | /// Matrix-vector multiplication. |
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337 | /// |
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338 | /// @return The resulting vector. |
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339 | /// |
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340 | // Jari, where should this go? |
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341 | const vector operator*(const vector&) const; |
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342 | |
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343 | /// |
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344 | /// Comparison operator. |
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345 | /// |
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346 | /// @return True if all elements are equal otherwise False. |
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347 | /// |
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348 | /// @see equal |
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349 | /// |
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350 | inline bool operator==(const matrix& other) const { return equal(other); } |
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351 | |
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352 | /// |
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353 | /// Comparison operator. |
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354 | /// |
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355 | /// @return False if all elements are equal otherwise True. |
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356 | /// |
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357 | /// @see equal |
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358 | /// |
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359 | inline bool operator!=(const matrix& other) const { return !equal(other); } |
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360 | |
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361 | /// |
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362 | /// The assignment operator. There is no requirements on |
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363 | /// dimensions, i.e. the matrix is remapped in memory if |
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364 | /// necessary. This implies that in general views cannot be |
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365 | /// assigned using this operator. Views will be mutated into |
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366 | /// normal matrices. The only exception to this behaviour on views |
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367 | /// is when self-assignemnt is done, since self-assignment is |
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368 | /// ignored. |
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369 | /// |
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370 | /// @return A const reference to the resulting matrix. |
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371 | /// |
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372 | /// @see int set(const matrix&) |
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373 | /// |
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374 | const matrix& operator=(const matrix& other); |
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375 | |
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376 | /// |
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377 | /// Add and assign operator. |
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378 | /// |
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379 | inline const matrix& operator+=(const matrix& m) { add(m); return *this; } |
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380 | |
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381 | /// |
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382 | /// Add and assign operator. |
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383 | /// |
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384 | inline const matrix& |
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385 | operator+=(const double d) { add_constant(d); return *this; } |
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386 | |
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387 | /// |
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388 | /// Subtract and assign operator. |
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389 | /// |
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390 | inline const matrix& operator-=(const matrix& m) { sub(m); return *this; } |
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391 | |
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392 | /// |
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393 | /// Multiply and assigment operator. |
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394 | /// |
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395 | /// @return Const reference to the resulting matrix. |
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396 | /// |
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397 | const matrix& operator*=(const matrix&); |
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398 | |
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399 | /// |
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400 | /// Multiply and assign operator. |
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401 | /// |
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402 | inline const matrix& operator*=(const double d) { scale(d); return *this; } |
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403 | |
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404 | |
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405 | private: |
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406 | |
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407 | /// |
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408 | /// Create a new copy of the internal GSL matrix. |
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409 | /// |
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410 | /// Necessary memory for the new GSL matrix is allocated and the |
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411 | /// caller is responsible for freeing the allocated memory. |
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412 | /// |
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413 | /// @return A pointer to a copy of the internal GSL matrix. |
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414 | /// |
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415 | gsl_matrix* create_gsl_matrix_copy(void) const; |
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416 | |
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417 | gsl_matrix* m_; |
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418 | gsl_matrix_view* view_; |
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419 | }; |
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420 | |
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421 | /// |
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422 | /// The output operator for the matrix class. |
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423 | /// |
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424 | std::ostream& operator<< (std::ostream& s, const matrix&); |
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425 | |
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426 | |
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427 | }} // of namespace gslapi and namespace theplu |
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428 | |
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429 | #endif |
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